基于FPGA的载波相移级联H桥多电平变流器

CPS-SPWM Multi-level Converter Based on FPGA

大功率电力电子变流装置得到了越来越深入的研究,在大容量电机驱动、交直流电力传输等场合的应用范围也越来越广泛。在大功率电力电子变流装置的实现上,一个重要的问题就是大功率器件的工作频率较低,无法应用PWM技术等优秀的调制技术。提出基于FPGA的多路PWM波形发生器,介绍其原理与设计,并应用于级联型多电平变频器控制系统,最后通过仿真和实验验证了对基于载波相移技术的级联多电平变流器数字控制的可行性;通过输出波形频谱分析,验证了载波相移SPWM是通过低频谐波的相互抵消来提高等效开关频率,而不是简单地将谐波向高次推移。

High power electronic equipment is increasingly deeply studied and is more and more widely applied in large capacitance motor drive, power transmission and so on. On the realization of high power electronic equipment, an important problem is that the working frequency of high power devices is too low to apply excellent modulated technique such as PWM. A multi-channel PWM waveform generator based on field programmable gate array （FPGA） was proposed, its principle and design procedure was given. The feasibility and correctness of this method is verified experimentally by being applied in cascaded multi-level converter system.